Two men from Thailand's insurgency-hit "Deep South" have been arrested over several small bomb attacks which rattled Bangkok on Friday, 2 August as it hosted a regional summit attended by US Secretary of State Mike Pompeo, leaving four people wounded but not disrupting the diplomatic event.
Two men from the far south were arrested after wires and ball bearings were found in an inactive device outside Thai police headquarters late Thursday, in what police said was a linked incident.
Police chief Jakthip Chaijinda confirmed the men came the Muslim-majority area bordering Malaysia which is in the grip of a 15-year insurgency.
But he said it was "too early" to clearly tie them with the rebellion.
Thailand, which has a grim history of political violence, remains deeply divided after a controversial March election returned a Thai junta to power as a civilian government.
"Security measures have been tightened. The public is urged not to panic," she added.
Small devices – believed to be so-called "ping pong bombs" around the size of a table tennis ball – exploded at several locations across the city.
They appeared to be symbolic attacks aimed at embarrassing the government during the major summit but not designed to cause mass casualties.
Bomb disposal experts were deployed around the Mahanakorn Tower – owned by the King Power group that counts Leicester City football club among its assets.
At least three other blasts hit the area around a government complex, authorities said.
The bombings took place just before a keynote speech by Pompeo, who has joined the Southeast Asian Foreign Ministers meeting, in which he praised Thailand for rejoining the "democratic fold".
Thailand's government urged the media to avoid speculation on the motive for the bombings.
The blasts come weeks after former junta leader Prayut was inaugurated as a civilian prime minister, sparking outcry among many pro-democracy supporters in a kingdom scored by divisions.
The junta manoeuvred itself back into power with the help of a fully appointed senate stacked with army loyalists and an electoral system its critics say was designed to limit the success of the pro-democracy parties.
The older "Red Shirt" pro-democracy group has also reacted with outrage to the election, but has so far remained off the streets with the army seemingly in an unassailable position.
Mass protests, coups and short-lived governments have defined Thailand's recent history, which is peppered with deadly bombings and shootings linked to politics.
Then, protesters from the pro-democracy "red shirt" faction smashed their way into the summit venue in the resort city of Pattaya demanding elections.
Pandemonium ensued, with a number of leaders having to be rescued from a hotel roof by Thai army helicopters while others fled by boat.
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